Its home page is at http://common-lisp.net/project/cl-mathstats and that is probably much more up to date.
Download ASDF package from http://common-lisp.net/project/cl-mathstats/cl-mathstats_latest.tar.gz
CL-MathStats is one of Gary King's Common Lisp packages. Blame him!
This page is linked from: Gary King
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